| Place Name | Unionville |
| Place Type | Census Designated Place |
| ZIP Code(s) | 59601 |
| County | Lewis and Clark County |
| Area Code(s) | 406 |
| Timezone | Mountain Standard Time (MST) |
| Population (2022) | 151 |
| Majority Ethnicity | White 100% |
| Metro/Micro Stats Area | Helena, MT |
| US Congressional District(s) | Montana At-Large |
| State House Districts | 79 |
| State Senate Districts | 40 |
| Race/Ethnicy | Percentage of Population (2021) |
|---|---|
| White | 100% |
| African American | 0% |
| Hispanic | 0% |
| Asian | 0% |
| Native American | 0% |
| Hawaiin/Pacific Islander | 0% |